AA: mac80211: delete the rt2x00 clk patch again

It is only required for newer kernels

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/branches/attitude_adjustment@37365 3c298f89-4303-0410-b956-a3cf2f4a3e73